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Deep Images and Particles


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We are beginning to introduce deep images into our pipeline.  Unfortunately we are currently using H12.1, so are forced to use RAT instead of EXR.

We have a small program to convert RAT to EXR just by translating the slices to layers in the EXR.

 

My question has to do with how the Deep Images are "flattened" in compositing.  (This may be more suited for a Nuke discussion, but thought someone here might have some insight).

 

With volumes and particles, how does it combine the many samples down a single pixel? What do I need to set up in my shader?  Is it based on alpha, opacity, etc?

 

I'm noticing some differences between normally rendered EXR and the RAT->EXR Deep Images.  I lose the wispy effect of millions of particles with varying alpha values.  Does it have to do with low sampling rates for the depth?

 

Any advice would be great!

 

Thanks

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